Rubber accelerator and method of using the same



Patented Aug. 18,1931

;; ;:nNrr ofSTATEs PATENT-SOFFICE No Drawing;

Thisinvention relates to rubber accelerators, more "particularly to substances of organic, nature and contain ng a phosphorus as an essentialelement. This. application is a continuation in part ofour co-pending applicatioil,VSerial:1V#206,937, filed July 19, 1927, entitled Rubber accelerator and method of using the same I In the aforesaid application we have described a series of compounds and a method of using th efsame, which-compounds are 'forme'dbycausing a reaction to take place between *organio oxygenv containing substances, such asphenols and alkyl alcohols with phosphorous pentasulphide, or the equivalent thereof, Such as phosphorus and sulphur'or-a [sulphide of phosphorus which is c'apable of reacting with saidcorn'pounds to form thiophos'phates. Specifically the compounds which we claim therein are di-alkyl lo diaryl,di5thio phosphoric acids.

; According to the, presentv invention we with-"the basic compound the acidity of the said acidsfis neutralized, thus rendering the O fii 0unds much morefsimple to handle and thGlGlSTlO dangerof'corros on taking place because of contact ofacidmaterials with metalsandfother substances subject: to

deterioration by acid. The new compounds are also much easier for the workmen to handle and in practicallyv all cases the neutralizedmateria-ls have a greater accelerating, value than the original di-thio acids. Somexof the di-thio acids. arenot suitable as accelerators due to a lack ofstability and guanidine.

loss.

ensues- 1; RoMIEUx, or ELIZABETH, AND L-UDWIG J. CHRISTMANN, on JERSEY CITY, NEW JERSEY, 'ASSIGNORS 'ro- AMERICAN o groan, any coRroRATIo 0F MAINE RUBBER ACCELERATOR AND METHOD or USING "IIHESAMEV Application fi led December 20, 1927. Serial No. 241,446. C

ofiensive odor, whereas the-salts are stable and odorless.

The method used in producing compounds of this type is very simple and it may consist merely in placing the di-substituted di-thioss phosphate in' a suitable vessel and adding thereto, in the presence of a suitable solvent,

acompound such as a soluble salt of a metal,

a metal, ammonia or an amine, andke'eping the reaction vessel cool to avoid losses.

As an example of the operation of ourfinvention we mixed 810 parts of di-ainyl dithiophosphate with 633 partsof di-phenylwhich was probably due to theneutralization ofthe acidity of the di-thio acid, and the -mixture was, therefore, kept cool to avoid Upon being tested as a rubber acceleratorit gave remarkable results asspecifically (:1

set forth below. H The compound most prob ably has the following structural formula: ctr-[no s-HQDPG l I CsHnO 8 Armedure which has been found Very;

effective is described in the co-pending application of Romieux and Wohnsiedler, Serial #223,056 filed e ber 15, 1927., "for Method vof making manufacture of a di-thiophosphate neutralized'with an aminesuchfis aniline, and the process described is; applicable to other di- 7 YANAMID COMPANY, or NEW The di-phenylguanidine went into solution with the. evolution of heat,

di-thiophosphates wherein there is specifically described the thiophosphates and other neutralizing substances; a

We have produced a largenumber of compounds of this type and have tested the same in the vulcanization of rubber bothat 258 F.

the following formula:

and 288": F. 'In making these tests we used 7 I Parts by S-S data 30 min/258 F. 30 min/288 F. cure cure Alcohol titi t M n Q Q 1 110p ose a oramme g\ & phoric acid salt used 8 :5 At break 8 At break was prea...

a B .5 e .5.

as a s 2 H m 2 a pa Ethyl Ammoman." 925 3400 800 1050 3255 700 v niline 815 3720 840 990 3190 780 0-tOll1idl116 535 2980 885 915 3330 300 c Zinc .640 3050 850 915 2885 770 Iso'propyl. AmmODia 1750 3960 730 1425 2780 705 Aniline 1545 3955 740 1270 3075 730 Sec. butylm Amyl Phenol Itwill be noted that we have made and tested the ammonia, aniline, ortho-toluidine and zinc salts of di-ethyl di-thio phosphoric acid, di-iso-prop'yl di-thiophosphoric acid, diphenyl di-thioph'osphoric acid and di-secbutyl di-thiophosphoric acid,all of the same showing excellent results in a standard rubber Z Wehave also prepared and tested quite a number of other compounds of the same type and have found these also to be excellent ac- .celerators. For example, we have prepared di-thiophosphoric acids from methyl, ethyl, iso-propyl, n-butyl, sec-butyl, amyl and like alcohols, phenol, ortho cresol and mixtures of phenols. -Tl1ese acids have been combined with ammonia, aniline, ortho-toluidine, zinc acetate,lead acetate, di-butyl amine, phenyl benzamidine, ortho-toluidine benzamidine, di-phenylguanidine, di-orthotolylguanidine, and methylamine.

It is apparent that our reaction is not confined to the substances which we have made and teste'd,,but the same isapplicable to a much larger variety-of substances of similar character aslis readily apparent from the above description. Our compounds are believed to have the following structural formula 4 I R0 sx no s in which R is an organic radicle of the aromatic or aliphatic type, and X is a basic radicle which may be a metallic or non-metal- .lic groupincluding primary or secondary jamines and ammonia as stated above.

the term amine, we intend to include such compounds as the substituted guanidines, the [ben z'amidines ammonia and substituted :ammonias. V i v What we claim is: 7 A

1.; methodhwhich comprises adding to and then vulcanizingthe mixture.

Byv

.pentasulphide and a guanidine, and thenvul canizing the mixture. v v

4. A method which comprises adding to a rubber mix prior to vulcanization, the reaction product of an alcohol with phosphorous pentasulphide and a substituted guanidine,

5. A method which comprises addingto a. rubber mix prior to vulcanization, the reaction product of amyl alcohol with'phosphorous pentasulphide and di-phenylguanidine, and then vulcanizing the mixture.

6. A rubber accelerator having most prob- 2.1 ably the followingstructural formula:

where R is an aliphatic or aromatic .radicle, comb ned w th a basic compound.

7, A rubber accelerator having most prob ably the following structural formula:

'9. A rubber accelerator comprising the reaction product of an alcohol withphosphorous pentasulphide and a di-substituted guanic me.

10. A rubber accelerator comprising the ren action product of an alcohol with phos horous pentasulphide and di-phenylguanidme.

1 1. A rubber accelerator comprising the reaction product of'an organic dithiophosphate and a basic organic compound which 5 is itself an accelerator.

12. A rubber accelerator comprising the reaction product-of an organic di-thiophosphate and a basic nitrogen compound v 13. A rubber-accelerator comprising the reaction product of an organic di-thiophosphate and an amine.

'14s. A rubber. accelerator-comprisingthe aniline salt of di-isopropyl di-thiophosphoric acid. 7 i

v v v h In testimony whereof, we have hereunto subscribed our names this16th day of Dec, 

